* dwarf2read.c (recursively_write_psymbols): New function.

	* dwarf2read.c (recursively_write_psymbols): New function.
	(write_psymtabs_to_index): Use it.

	* dwarf2read.c (struct dwarf2_queue_item) <pretend_language>: New
	field.
	(load_cu, dw2_do_instantiate_symtab, process_psymtab_comp_unit)
	(load_partial_comp_unit): Update.
	(queue_comp_unit): Add argument 'pretend_language'.
	(process_queue): Update.
	(psymtab_to_symtab_1): Skip dependencies that have a user.
	(load_partial_comp_unit_reader): Give meaning to the 'data'
	argument.
	(load_full_comp_unit): Add 'pretend_language' argument.
	(process_full_comp_unit): Add 'pretend_language' argument.  Set
	language on CU.
	(process_imported_unit_die, read_file_scope, read_type_unit_scope):
	Update.
	(maybe_queue_comp_unit): Add 'pretend_language' argument.
	(follow_die_offset, follow_die_sig, read_signatured_type_reader):
	Update.
	(prepare_one_comp_unit): Add 'pretend_language' argument.

	* dwarf2read.c: (dwarf2_per_cu_ptr): New typedef.
	(struct dwarf2_per_objfile) <just_read_cus>: New field.
	(struct dwarf2_per_cu_data) <imported_symtabs>: New field.
	(dw2_do_instantiate_symtab): Check whether symtab was read in
	before queueing.
	(dw2_instantiate_symtab): Add assertion.  Call
	process_cu_includes.
	(process_psymtab_comp_unit): Compute 'dependencies' for psymtab.
	(partial_symtab_p): New typedef.
	(set_partial_user): New function.
	(dwarf2_build_psymtabs_hard): Use set_partial_user.
	(scan_partial_symbols): Add imported CU to imported_symtabs.
	(dwarf2_psymtab_to_symtab): Call process_cu_includes.
	(psymtab_to_symtab_1): Do nothing if psymtab is readin.
	(get_symtab, recursively_compute_inclusions)
	(compute_symtab_includes, process_cu_includes)
	(process_imported_unit_die): New functions.
	(process_die) <DW_TAG_imported_unit>: New case.
	(dwarf2_per_objfile_free): Free 'imported_symtabs'.

	* dwarf2read.c (struct dwarf2_per_cu_data) <psymtab>: Update
	comment.
	(struct partial_die_info) <locdesc>: Remove.
	<d>: New field.
	(process_psymtab_comp_unit): Add 'read_partial' argument.
	Update.
	(process_type_comp_unit, dwarf2_build_psymtabs_hard): Update.
	(scan_partial_symbols): Handle DW_TAG_imported_unit.
	(add_partial_symbol): Update.
	(process_die): Handle DW_TAG_partial_unit.
	(read_file_scope): Update comment.
	(load_partial_dies): Handle DW_TAG_imported_unit.
	(read_partial_die): Handle DW_TAG_partial_unit, DW_AT_import.
	(determine_prefix, dwarf2_name): Handle DW_TAG_partial_unit.